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>“These precisely localized fast radio bursts came from the outskirts of their home galaxies, removing the possibility that they have anything to do with supermassive black holes,” Dr. Bhandari said.
My guess for the cause of FRBs is black hole lightning. You don't need supermassive black holes for that. It's like how there's thunderstorms all the way up through category five hurricanes: even the thunderstorm which not even a tropical storm can have big lightning strikes. Same thing with the regular, non-supermassive black holes far from the centers of the galaxies: they can have lighning big enough to make an FRB detectable on Earth.
To have FRBs be black hole lightning as I hypothesize, there would have to be some unknown process electrically charging black holes to instigate such large "dielectric breakdown of the vacuum," as I call it, which is like pulling lightning out of not only accretion matter, but possibly from the quantum flux of zero point particles. Those electrons in the zero point flux are as real as the regular atomic electrons which could stimulate lightning between a black hole and some mass of accreting material. Since we still don't know what leads to the large charge distributions which stimulate lightning locally on Earth, it is not so crazy to think that some cosmological process gives birth to a class of stars which eventually form ordinary, non-supermassive black holes, all thoughout galaxies' centers and outskirts, and then some as-yet-not-understood process in electrogravitation causes the ordinary BH to become so charged that it can make large cosmological lightning discharges, either by pulling electrons out of accreting material or even possibly directly from the vacuum.
